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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd12c04de68b9ff514c47f1e826e23af169299906791a4050cb2d258ce97eb7cc' 
  AND token = 'Hm/qdtowhETXa2nKd/NxJy18EHMoyCxfzMe2LgAOJlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}